package org.example.lotterysystem.service.impl;

import lombok.extern.slf4j.Slf4j;
import org.example.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import org.example.lotterysystem.common.utils.JacksonUtil;
import org.example.lotterysystem.common.utils.RedisUtil;
import org.example.lotterysystem.controller.param.DrawPrizeParam;
import org.example.lotterysystem.controller.param.ShowWinningRecordsParam;
import org.example.lotterysystem.dao.dataobject.*;
import org.example.lotterysystem.dao.mapper.*;
import org.example.lotterysystem.service.DrawPrizeService;
import org.example.lotterysystem.service.dto.WinningRecordDTO;
import org.example.lotterysystem.service.enums.ActivityPrizeStatusEnum;
import org.example.lotterysystem.service.enums.ActivityPrizeTiersEnum;
import org.example.lotterysystem.service.enums.ActivityStatusEnum;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.*;

import static org.example.lotterysystem.common.config.DirectRabbitConfig.EXCHANGE_NAME;
import static org.example.lotterysystem.common.config.DirectRabbitConfig.ROUTING;


@Service
@Slf4j
public class DrawPrizeServiceImpl implements DrawPrizeService {


    private final String WINNING_RECORDS_PREFIX = "WINNING_RECORDS_";
    /**
     * 缓存的时间
     */
    private final Long WINNING_RECORDS_TIMEOUT = 60 * 60 * 24 * 2L;


    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private ActivityMapper activityMapper;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private PrizeMapper prizeMapper;
    @Autowired
    private WinningRecordMapper winningRecordMapper;
    @Autowired
    private RedisUtil redisUtil;


    @Override
    public void drawPrize(DrawPrizeParam param) {
        Map<String, String> map = new HashMap<>();
        map.put("messageId", String.valueOf(UUID.randomUUID()));
        map.put("messageData", JacksonUtil.writeValueAsString(param));
        // 发消息: 交换机、绑定的 key、消息体
        rabbitTemplate.convertAndSend(EXCHANGE_NAME, ROUTING, map);
        log.info("mq消息发送成功:map={}", JacksonUtil.writeValueAsString(map));
    }

    @Override
    public Boolean checkDrawPrizeParam(DrawPrizeParam param) {

        ActivityDO activityDO = activityMapper.selectById(param.getActivityId());
        ActivityPrizeDO activityPrizeDO = activityPrizeMapper.selectByAPId(param.getActivityId(), param.getPrizeId());
        // 活动是否存在 && 有效
        if (null == activityDO) {
            // throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_IS_EMPTY);
            log.info("校验抽奖请求失败！失败原因：{}", ServiceErrorCodeConstants.ACTIVITY_IS_EMPTY.getMsg());
            return false;
        }
        if (activityDO.getStatus()
                .equalsIgnoreCase((ActivityStatusEnum.COMPLETED.name()))) {
            // throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_COMPLETED);
            log.info("校验抽奖请求失败！失败原因：{}", ServiceErrorCodeConstants.ACTIVITY_COMPLETED.getMsg());
            return false;
        }

        // 奖品是否存在 && 有效
        if (null == activityPrizeDO) {
            // throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_IS_EMPTY);
            log.info("校验抽奖请求失败！失败原因：{}", ServiceErrorCodeConstants.ACTIVITY_PRIZE_IS_EMPTY.getMsg());
            return false;
        }
        if (activityPrizeDO.getStatus()
                .equalsIgnoreCase(ActivityPrizeStatusEnum.COMPLETED.name())) {
            // throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_PRIZE_COMPLETED);
            log.info("校验抽奖请求失败！失败原因：{}", ServiceErrorCodeConstants.ACTIVITY_PRIZE_COMPLETED.getMsg());
            return false;
        }

        // 中奖者人数是否和设置奖品数量一致
        if (activityPrizeDO.getPrizeAmount() != param.getWinnerList().size()) {
            // throw new ServiceException(ServiceErrorCodeConstants.WINNER_PRIZE_AMOUNT_ERROR);
            log.info("校验抽奖请求失败！失败原因：{}", ServiceErrorCodeConstants.WINNER_PRIZE_AMOUNT_ERROR.getMsg());
            return false;
        }
        return true;
    }

    @Override
    public List<WinningRecordDO> saveWinnerRecords(DrawPrizeParam param) {
        // 查询相关信息：活动、人员、奖品、活动关联奖品表
        ActivityDO activityDO = activityMapper.selectById(param.getActivityId());
        List<UserDO> userDOList = userMapper.batchSelectByIds(param.getWinnerList()
                    .stream()
                    .map(DrawPrizeParam.Winner::getUserId)
                    .toList());
        PrizeDO prizeDO = prizeMapper.selectById(param.getPrizeId());
        ActivityPrizeDO activityPrizeDO = activityPrizeMapper.selectByAPId(param.getActivityId(), param.getPrizeId());

        // 构造中奖者记录，保存
        List<WinningRecordDO> winningRecordDOList = userDOList.stream()
                .map(userDO -> {
                    WinningRecordDO winningRecordDO = new WinningRecordDO();
                    winningRecordDO.setActivityId(activityDO.getId());
                    winningRecordDO.setActivityName(activityDO.getActivityName());
                    winningRecordDO.setPrizeId(prizeDO.getId());
                    winningRecordDO.setPrizeName(prizeDO.getName());
                    winningRecordDO.setPrizeTier(activityPrizeDO.getPrizeTiers());
                    winningRecordDO.setWinnerId(userDO.getId());
                    winningRecordDO.setWinnerName(userDO.getUserName());
                    winningRecordDO.setWinnerEmail(userDO.getEmail());
                    winningRecordDO.setWinnerPhoneNumber(userDO.getPhoneNumber());
                    winningRecordDO.setWinningTime(param.getWinningTime());
                    return winningRecordDO;}
                ).toList();

        winningRecordMapper.batchInsert(winningRecordDOList);
        // 缓存中奖者记录
        // 1. 缓存奖品维度的中奖记录(WinningRecord_activityId_prizeId, winningRecordDOList(奖品维度))
        cacheWinningRecords(param.getActivityId() + "_" + param.getPrizeId(), winningRecordDOList, WINNING_RECORDS_TIMEOUT);
        // 2. 缓存活动维度的中奖记录(WinningRecord_activityId, winningRecordDOList(活动维度))
        // 当活动已完成, 再去存放活动维度中奖记录
        if (activityDO.getStatus()
                .equalsIgnoreCase(ActivityStatusEnum.COMPLETED.name())) {
            List<WinningRecordDO> allList = winningRecordMapper.selectByActivityId(param.getActivityId());
            cacheWinningRecords(String.valueOf(param.getActivityId()), allList, WINNING_RECORDS_TIMEOUT);
        }
        return winningRecordDOList;
    }

    @Override
    public void deleteRecords(Long activityId, Long prizeId) {
        if (null == activityId) {
            log.warn("要删除中奖记录相关的活动id为空！");
            return;
        }
        // 删除数据表
        winningRecordMapper.deleteRecords(activityId, prizeId);

        // 删除缓存 (奖品维度、活动维度)
        if (null != prizeId) {
            deleteWinningRecords(activityId + "_" + prizeId);
        }
        deleteWinningRecords(String.valueOf(activityId));
    }

    @Override
    public List<WinningRecordDTO> getRecords(ShowWinningRecordsParam param) {
        // 查询 Redis : 奖品、活动
        String key = null == param.getPrizeId()
                ? String.valueOf(param.getActivityId())
                : param.getActivityId() + "_" + param.getPrizeId();
        List<WinningRecordDO> winningRecordDOList = getWinningRecords(key);
        if (!CollectionUtils.isEmpty(winningRecordDOList)) {
            return convertToWinningRecordDTOList(winningRecordDOList);
        }
        // 如果 Redis 不存在，查库
        winningRecordDOList = winningRecordMapper.selectRecords(param.getActivityId(), param.getPrizeId());
        // 存放记录 到 Redis
        if (CollectionUtils.isEmpty(winningRecordDOList)) {
            log.info("查询的中奖记录为空！param:{}", JacksonUtil.writeValueAsString(param));
            return List.of();
        }
        cacheWinningRecords(key, winningRecordDOList, WINNING_RECORDS_TIMEOUT);
        return convertToWinningRecordDTOList(winningRecordDOList);
    }

    private List<WinningRecordDTO> convertToWinningRecordDTOList(List<WinningRecordDO> winningRecordDOList) {
        return winningRecordDOList.stream().map(winningRecordDO ->  {
            WinningRecordDTO winningRecordDTO = new WinningRecordDTO();
            winningRecordDTO.setWinnerId(winningRecordDO.getWinnerId());
            winningRecordDTO.setWinnerName(winningRecordDO.getWinnerName());
            winningRecordDTO.setPrizeName(winningRecordDO.getPrizeName());
            winningRecordDTO.setPrizeTier(
                    ActivityPrizeTiersEnum.forName(winningRecordDO.getPrizeTier()));
            winningRecordDTO.setWinningTime(winningRecordDO.getWinningTime());
            return winningRecordDTO;
        }).toList();
    }


    /**
     * 从缓存中删除缓存（奖品、活动维度）
     *
     * @param key
     */
    private void deleteWinningRecords(String key) {
        try {
            if (redisUtil.hasKey(WINNING_RECORDS_PREFIX + key)) {
                // 存在则删除
                redisUtil.del(WINNING_RECORDS_PREFIX + key);
            }
        } catch (Exception e) {
            log.error("删除中奖记录缓存异常！key:{}", key);
        }
    }

    /**
     * 缓存中奖记录
     *
     * @param key
     * @param winningRecordDOList
     * @param time
     */
    private void cacheWinningRecords(String key, List<WinningRecordDO> winningRecordDOList, Long time) {
        String str = "";
        try {
            if (!StringUtils.hasText(key)
                    || CollectionUtils.isEmpty(winningRecordDOList)) {
                log.warn("要缓存的内容为空！key:{}, value{}", key, JacksonUtil.writeValueAsString(winningRecordDOList));
                return;
            }

            str = JacksonUtil.writeValueAsString(winningRecordDOList);
            redisUtil.set(WINNING_RECORDS_PREFIX + key,
                    str,
                    time);

        } catch (Exception e) {
            log.error("缓存中奖记录异常! key:{}, value{}", WINNING_RECORDS_PREFIX + key, str);
        }
    }

    /**
     * 从缓存中获取中奖记录
     *
     * @param key
     * @return
     */
    private List<WinningRecordDO> getWinningRecords(String key) {
        try {
            if (!StringUtils.hasText(key)) {
                log.warn("要从缓存中查询中奖记录的 key 为空！");
                return List.of();
            }
            String str = redisUtil.get(WINNING_RECORDS_PREFIX + key);
            if (!StringUtils.hasText(str)) {
                return List.of();
            }

            return JacksonUtil.readListValue(str, WinningRecordDO.class);
        } catch (Exception e) {
            log.error("从缓存中查询中奖记录异常！key:{}", WINNING_RECORDS_PREFIX + key);
            return List.of();
        }

    }
}
